Below the scheme uses TDA 2002 as an amplifier. The scheme produces 4 Watts when powered 15 Volts. The minimum input signal 95 mV with pre-amplifier on the scheme and 0.65 In without him.
The audio frequency amplifier with preamplifier on TDA 2002 (4W)

Components used:

R1

2.2 KW

R2

330 ohms

R3

4.7 Ohm potentiometer

R4

330 Ohm

R5

1 kOhm

R6

1.5 W

C1, C6

100nF (polyester)

C2

100mF/25V (electrolytic)

C3, C7

1mF/25V (electrolytic)

C4

1000uF/25V (electrolytic)

C5

10uF/25V (electrolytic)

Q1

BC547

U1

TDA2002

LS1

The loudspeaker.



Notes:

Proportional to the impedance of a speaker varies the output power, respectively:

LS1

Output power

2 Ohm

6,5 W rms

4 Ohms

4,2 W rms

6 Ohms

3W rms

8 Ohms

2,25 W rms

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